Method of and apparatus eor operating printing telegraphs



July'24, 1923. L463J3fi E. E. KLEINSGHMIDT METHOD OF AND APPARATUS FOR OPERATING PRINTING TELEGRAPHS Filed May 1, 1919 INVENTOR WITNESS:

Patented July 24, 1923.

"UNITED STATES nnwnnn PATENT OFFICE.

n'xrnmsc'nmnr, or BROOKLYN, new YORK, Assrenon ro THE, KLEIN- scnnrn'r nrnc'rnrc COMPANY, A conronarron on NEW yonx.

flmrnon or AND arrnnnrusron OPERATING PRINTING 'rnrnemns.

Application filed May 1,

To all whom may concern:

sornnn'r, a citizen of the United States, re-

siding in' New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Methods of and Appatus for Operating Printing 'T'elegraphs, of which the following is a specification.

My invention more particularly relates to theoperation of a telegraph system in which each station is equipped with a transmitting device, such as a tape-controlled device and with afreceiving device, and in which information, such as groups'of electric impulses corresponding inco'deto a letter, is alternately transmitted between the two stations in opposite directions. Hitherto, in a duplex telegraph system of this general character, it has been usual to use an artificial line in order that the relay at the transmitting station may not be affected by the electric impulses sent out from the transmitting station. In such a system, however, the characteristics of the artificial line must be kept the same as those of the mainline joining the twostations, and as the latter is affected by external influences, such as the weather, its characteristics vary, with the consequence that the artificial line must frequently be adjusted inorder that its capacity, self-induction, etc. may be keptthe same as that of the 'main line, and such adjustment neoessitatesthe presence of a skilled electrician.

One of the objects .of my invention is the provision of a telegraph system in which information,"represented in general by groups of 1 electric impulses, is alternately transmitted in opposite directions between the two stations and automatic means, such as a rotating distribnter, is provided at each stareference the accompanying drawing,

1919. Serial No.'293 ,949.

which illustrates diagrammatically a print icng telegraph system embodying my inven- Referring, n0w, to the drawing, in which I I have shown one embodiment of my invention, A and B are two stations similarly equipped to send and receive messages, and

and are represented by the reference letters C and D,respectively. These transmittin devices may be constructed in any Wel known manner, though I preferably make the same in accordance with the invention covered by my application Serial No. 293,950, which was filed in the Patent Ofiice ofeven date with my present application, and which relates to a transmitter operated by a perforated tape. printers of the two stations are diagrammatically represented by a seriesof magnets E and F, respectively, and may be constructed in accordance with any well-known receiving device, though preferably constructed in accordance with the invention covered by my March 20, 1923. I i 'As theapparatus and wiring of two stationsA and B are thesame, I will describe the same with reference to station A only, the apparatus and wiring at station B being indicated by similar referencenumerals,

but with the letter b appended. "In the drawing, 1 is a motor which drives a gear- 2 preferably through a worm and worm gear, 'asshown, the latter being secured on a shaft 3, it being understood that a friction drive is provided between the worm gear and shaft in order that the shaft may be held stationary while themotor is continu ously rotating. A stop arm 4 is secured to the shaft 3 and is arranged to engage one arm of an elbow lever, which is normally held in position to engage the arm 4 and which stops the rotation of the arm 4 and the Patent No. 1,448,? 50, issued The receiving devices or shaft during each rotation. A brush arm 5 v is secured to the outer end of the shaft 3, and

is provided with two sets of brushes 6 and 7 insulated from each other, which bear against a stationary commutator 8. I have, for convenience, referred in the claims to a rotating distributer, and in the embodiment of myinvention here shown, it will be understood that ,this element corresponds to the rotatingbrushes, The commutator is divided into two sections, 81 and 82, respectively, the insulation dividing the two sections being indicated in general at 83, The transmitting segments 9 and 10 are connected to stationary contacts 11 and 12 of the transmitter C,"while the transmitting segments 13, 14, 15, 16 and 17 are respectively connected to movable contacts 18, 19, 20, 21

' and 22 of. the transmitter C. One'pole of the line battery 23 is connected through a resistance 24to the contact bar 11, while the other. pole of the battery is connected through the resistance 25 to the contact bar 12, the middle of the battery being grounded as shown. Segment 26, which is disposed on the receiving section of the distributer 8 diametrically opposite the segment 10, is connected to a starting magnet 27, theother terminal ofwhich is grounded as shown. Segment 28 of the transmitter is connected to the contact point of the polarized relay 29 with which, the armature 30 engages when it is moved to the left. The armature of this relay is connected through a resistance 31 and a battery 32 to the ground. Receiving or selecting segments 33, 34:, 35, 36 and 37 are connected to the respective receiving magnetsfof the printer E. The relay 29 is connected to the line 38 and to the segment 39 on the receiving side ofthe commutator 8. tAsegment 10 on thereceiving side of the commutator is connected by a conductor 11, to the ground. Segment 12 onthe transmitting side of the commutator, is connected bya conductor. 43 to theline 38 at a point beyond the relay 29. Segme'ntAA of the commutator is connected by a conductor45 to.:;a stationary contact 16 of a circuit breaker, the movable contact 417 of which is mounted on a spring arm 48, the spring arm being connected through the conductor 49, to

the. start or sixth-impulse magnet 50, and

through the battery 51 to the ground, so

that the circuit of the magnet 50 is closed at each rotation ofthe distributer provided the contacts 46, 17 are closed. In a printing telegraph system of the general character illustrated, a printing magnet (not shown herein) is used for printing the characters.

The start or sixth-impulse magnet isa relay cont-rolling the circuit of the printing mag net. The contact 17 is moved away from the contact 46 by one section 52 of a compound arm 53, theother section of which is designatedby the numeral 5 1. The two sections 52 and54t are pivoted together at 55 so thatthe section 52 is, free to move in a horizontal plane with respect to the section I 54,. while the section 54, and accordingly the whole arm 53, is pivoted for movement in a :vertical .planeon a pivot 56, on a bracket, as ,shown. The section 52 is drawn against a stop 57 by a spring 58 and a spring 59 lug 60 is carried out of engagementwith the worm by means ofa magnet 6ftwhich at-' tracts. an armature 63 on the free end of the section 5 1, when the magnet is energized. One terminal of themagnet 6 1 is grounded, while the opposite terminal is connected by a conductor 65 to one of theterininals of each of the magnets ofthe printer E, sothat the.

magnet 64L is energized while the magnets of the printer are energized. I, v 7

In my application S rial No. 293,950, ov e e a. anpp r ng m gnet h wn w i h is e g d befor he tree mittingbrushes o h d st ibu e passpve the corresponding transmitting fseg nents and which acts to feedthe perforated talpe forward in the interval "between the f trans mission of electric impulses over theiine. hi m g e i here indicated y ere nence numeral 66,, and its circuit includes a movable c t t 67 w i i e-opem siui h. a ti ary ont t'fis, iv ble- 91 tact being mounted on a spring finger- 69. The spring finger is operated by a cam 7O secured on the shaft 3 so that the contacts e lo d nce dur ea v .n o the shaft. A battery 71 is included in this circuit. -A shunt circuit 72 around the larmature 30 of the relay 29is controlled "by a n a fing an sc nreq d twe the wire leading to the segment 28 and to the conductor which extends from the armature 30 to the ground, I

In the drawings, theinstrum ents at each of the stations are shown at rest with the exception of the motors,,which are continuouslyrotating. Now, when the operator at either station desires to send a message, he will depress the contact finger.;73, thereby closing a circuit from the ground through the battery 32, fresistance 31,, contact 73,. conductor 72, conductor 28, brushes 7,', seg

nt 6 and ma n 2 te.. h .,.g.r' ii thereby energizing the starting magnet 27 and causing the sarne toattractani aiinature 75 on one arm 0t the bell 5 en athe ,oi i Q teermjfwlr re gagement with the arm 1 secured onjthe shaft T e/ h ft ihen' t r tatefand,

the brushes jca rried by the brushlh older 5,

which secured thereto, are carried over the commutator. As the brushes asstver v the segments of the transmitting side 82, no

' through the battery 23, resistance 24, con

28 brushes 7", segment 26 tact bar 11, segment 9, brushes 7, segment 42 conductor 43,1ine conductor 38, polarized relay 29, segment 38", conductor 41 to the ground. The relay 29 is thereby energized, but with a current in a direction to move the armature 30 to the right H and away from they contact at the left. The purpose of sending this impulse, which may be termed a cle-aring impulse, is to place the relay tongue in proper position to receive the following "starting, impulse which immediately follows when the brushes engage the contacts 42 and 10. This circult, is the 'same .as'; the one just traced, with the exception that the left sideof the battery 23is connected through the resistance 25 and contact bar l2ito' the segment 10, and thence to the brushes 7 vand the segment 42, the remainderof the circuit being the same as that just .traced. The impulse now sent over vthe line will again energize the polarized relay 29", but since the impulse is in the opposite direction from that sent over the line when the brushes were in engagement with the contacts 9 and 42, the armature 30 is now moved in the opposite direction and against its contact, thereby closing a local circuit at station B from the battery 32 through the resistance 31", armature 30*, segment starting magnet 27 to the ground; Magnet 27? is thereby energized and releases the arm 4", and the commutator 8 begins to rotate.

The beginning of the segment 10 is diametricall opposite the segment 26, so that the distri uter 8 begins to rotate with its brushes 180 behind those of the distributer 8, the brushes 7 of the commutator 8 then passing in succession over the transmittting segments 13, 14, 15, 16, 17 and the seg ment 12, thereby transmitting message impulses over the line in accordance with the code determined by the combination set up in the transmitter C, as more fully ex- Serial No.

plained While the in my application above referred to.

over the segments 13, 14, 15, 16 and 17, the brushes 7 of the commutator 8 will pass over the segments 33", 34 35 36 and 37", respectively, thereby energizing the proper magnets of the printer F through local circuits comprising the battery 32", resistance 31", armature 30*, segment 28 brushes 7'? and the respective magnets of the printer F, and through the conductor and magnet 64 to the ground, ;Now, when the brushes 7 come into engagement with the segment 26, the

arm 4.will be ina'position to engage the elbow lever 74 and momentarily stop the,

rotation of the commutator 8. As the brushes 7 continue to rotate they will come into engagement with the segments 9 and 42 onthe transmitting side of the commuthe battery 23 at the station B, which station now becomes the transmitting st'ation, to the station A, which is pnowE-the receiving station, in precisely the same manner as the clearing impulse previously "described as being sent from station A to station B. Then, as the brushes come into 7 contact with the segments 10 and 42", a starting impulse of opposite polarity: will besent from station B, which causes the magnet 27 at station A to be energized,

thuscausing-the brushes 7 at statiOn A to start rotating and to pass overvtheueceiving segments 33, 34, 35, 36,,37Qat station A, while the brushes 7 at station are passing over the transmitting segments 13", 14 15", 16 and 17 of the commutator 8 It will thus be apparent that groups of impulses designating letters will be alternately transmitted between the stations A and B in opposite directions, and since the distributing brushes at each station begin to rotate over the receiving side of the commutator in response to an impulse passingthrough the transmitting side of the other commutator, the rotation of the two distributers is so correlated that the brushes of the one distributer are passing over the receiving segments while the brushes of the other distributor are passing over the transmitting segments, and as this relation is automatically maintained, it will be apparent that no provision is necessary for compensating for'the lag in the line.

From the description already given, it will be apparent that the magnet 64 is energized and the contacts 46 and 47 are accordingly closed during the time that the magnets of the printer E are energized, or, in other words, while a message is being received, and that when no message is being received the magnet 64 is de-energized and the contacts 46 and 47 opened, thereby rendering it impossible to actuate the start or sixth-impulse magnet 50.

It is undesirable to operate a start magnet when no messages are being received.

What I claim and desire to secure by Letters Patent of the United States is:

1. A printing telegraph system comprising a rotary distributor divided into signal receiving and transmitting sections, a stop position for said distributor immediately preceding said signal receiving section,

mediately preceding said signal transmittirrgfsection; a' sta'rt-stop magnetfor said {in 'Wh icii tiie"receiiiei" opertin g"'rneiins 25 distributor, a receiving reiay adapted to complete local energizing circuits through said stzirt magnet and said receiving dis tributor section, anda shunt circuit around" saidrecelvin'g"relay arranged to permit the complet on" of a local energizing circuit through said stirt' relziy;

1, and a'shunt'circuit' from said transmit tin-g section, around Silld IGCGlVlHg relay.

3. Thecombination as set'forth' in claim 2 afieachi'of two stations so arra'ngedthat' thedistributors operate to alternately trans mi't' to and receive from the'op'p osite sta' tioni' 4. a' printing telegraph systein', it re tarydistributor, a drive shaft 'for'said dis tributo r; a phi'rality' of receiver selectors controlled by said distribiitor, a receiver 0peratirig'fmeans controlled 'by said distributor f and alsocontrolled by means carried by said distributor shit-ft."

5; The combinati'on' as set forth'in claim 2. The/combination as set'forthfin claimcoiripris'es' an operating agnet.

, The combination s s t forth in I biaim 5 iriwhichfsaid' operatiiig jmelgnet is "e'nei' i'ze'd" from a" circui' last nientloiied means? 7, Th' Combi a ns setffo rthfin claim" t interrupted by said 6 in which said fla'st mentioned niea'ns com? pri'ses'a contact ariri; and ascreiVcarried by said distributor shaft adapted to ac'-' tufiit'esaid arm)" 8.' The" combination as set forth in 7 in which "said contact arm isjoarried by anelectromag'iietfl armature; and an electrp'f magnet controlled said distributor adapted to actuate'said' armature;

In testimonyfivhereof I" have 'hereniito 'j signedfmy' name m the presence of two 

